experiment in lcd 1.5x fonts ?

hello all

im new to arduino, esp lcd
but seeing some fun toys being discussed in eevblog
i wanted to see how the display works

i got some fun setup to play this : IDE -- CH340 -- clone pro mini -- 8544 (5110 lcd)

before long, i started to dig with the library.

pls correct me my short knowledge

so i try to make a "mu" symbol by replacing 1 of the character definations inside "Nokia 5100 LCD Example Code by Jim Lindblom"

original
,{0x44, 0x64, 0x54, 0x4c, 0x44} // 0x7a z

edit
,{0x7c, 0x20, 0x20, 0x7c, 0x80} // 0x7a z

i was wondering how to expand this 5x8 into larger 1.5x size

now i did some noob binary math, it seem workable to store the character as 7x12. 1.5bytes ? x 7 vertical?

by bitwise shifting, i could split a "character vertical frame" into an upper 8pixel and a later 4pixel to add to whatever is left below. i could split the lower character to get its upper 4 pixels and this 2 could make a 1 byte thing to output. the binary pixel math can be solved in opencalc at this point. but is this something somebody have tried before?

then, i wanted to delete all the "picture" in the library to test load the sketch faster, but it becomes giberish ha ha ! is there already a library that is skeleton to play with fonts?

but i dont know how to use the
static const byte ASCII[5] PROGMEM
so at this point, i could not display anything yet

question is, did i approach this the right way? as in doing a 1 half sized character block?

i hope not too many questions for a half a bit me